cmd/compile: eliminate arch-specific typedefs

Arch backends already provide us Widthint and Widthptr, which is ample
information to figure out how to define the universal "int", "uint",
and "uintptr" types.  No need for providing a generic typedef
mechanism beyond that.

Change-Id: I35c0c17a67c80605a9208b93d77d6960b2cbb17d
Reviewed-on: https://go-review.googlesource.com/20153
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/compile/internal/amd64/galign.go

@@ -34,16 +34,6 @@ var (
 	cmpptr int = x86.ACMPQ
 )
 
-/*
- * go declares several platform-specific type aliases:
- * int, uint, and uintptr
- */
-var typedefs = []gc.Typedef{
-	{"int", gc.TINT, gc.TINT64},
-	{"uint", gc.TUINT, gc.TUINT64},
-	{"uintptr", gc.TUINTPTR, gc.TUINT64},
-}
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -55,9 +45,6 @@ func betypeinit() {
 		movptr = x86.AMOVL
 		leaptr = x86.ALEAL
 		cmpptr = x86.ACMPL
-		typedefs[0].Sameas = gc.TINT32
-		typedefs[1].Sameas = gc.TUINT32
-		typedefs[2].Sameas = gc.TUINT32
 	}
 
 	if gc.Ctxt.Flag_dynlink {
@@ -75,7 +62,6 @@ func Main() {
 	gc.Thearch.Thechar = thechar
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
-	gc.Thearch.Typedefs = typedefs
 	gc.Thearch.REGSP = x86.REGSP
 	gc.Thearch.REGCTXT = x86.REGCTXT
 	gc.Thearch.REGCALLX = x86.REG_BX

src/cmd/compile/internal/arm/galign.go

@@ -21,16 +21,6 @@ func linkarchinit() {
 
 var MAXWIDTH int64 = (1 << 32) - 1
 
-/*
- * go declares several platform-specific type aliases:
- * int, uint, and uintptr
- */
-var typedefs = []gc.Typedef{
-	{"int", gc.TINT, gc.TINT32},
-	{"uint", gc.TUINT, gc.TUINT32},
-	{"uintptr", gc.TUINTPTR, gc.TUINT32},
-}
-
 func betypeinit() {
 	gc.Widthptr = 4
 	gc.Widthint = 4
@@ -41,7 +31,6 @@ func Main() {
 	gc.Thearch.Thechar = thechar
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
-	gc.Thearch.Typedefs = typedefs
 	gc.Thearch.REGSP = arm.REGSP
 	gc.Thearch.REGCTXT = arm.REGCTXT
 	gc.Thearch.REGCALLX = arm.REG_R1

src/cmd/compile/internal/arm64/galign.go

@@ -21,16 +21,6 @@ func linkarchinit() {
 
 var MAXWIDTH int64 = 1 << 50
 
-/*
- * go declares several platform-specific type aliases:
- * int, uint, and uintptr
- */
-var typedefs = []gc.Typedef{
-	{"int", gc.TINT, gc.TINT64},
-	{"uint", gc.TUINT, gc.TUINT64},
-	{"uintptr", gc.TUINTPTR, gc.TUINT64},
-}
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -41,7 +31,6 @@ func Main() {
 	gc.Thearch.Thechar = thechar
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
-	gc.Thearch.Typedefs = typedefs
 	gc.Thearch.REGSP = arm64.REGSP
 	gc.Thearch.REGCTXT = arm64.REGCTXT
 	gc.Thearch.REGCALLX = arm64.REGRT1

src/cmd/compile/internal/gc/align.go

@@ -618,39 +618,6 @@ func typeinit() {
 	Simtype[TFUNC] = Tptr
 	Simtype[TUNSAFEPTR] = Tptr
 
-	// pick up the backend thearch.typedefs
-	for i = range Thearch.Typedefs {
-		s := Lookup(Thearch.Typedefs[i].Name)
-		s1 := Pkglookup(Thearch.Typedefs[i].Name, builtinpkg)
-
-		etype := Thearch.Typedefs[i].Etype
-		if int(etype) >= len(Types) {
-			Fatalf("typeinit: %s bad etype", s.Name)
-		}
-		sameas := Thearch.Typedefs[i].Sameas
-		if int(sameas) >= len(Types) {
-			Fatalf("typeinit: %s bad sameas", s.Name)
-		}
-		Simtype[etype] = sameas
-		minfltval[etype] = minfltval[sameas]
-		maxfltval[etype] = maxfltval[sameas]
-		Minintval[etype] = Minintval[sameas]
-		Maxintval[etype] = Maxintval[sameas]
-
-		t = Types[etype]
-		if t != nil {
-			Fatalf("typeinit: %s already defined", s.Name)
-		}
-
-		t = typ(etype)
-		t.Sym = s1
-
-		dowidth(t)
-		Types[etype] = t
-		s1.Def = typenod(t)
-		s1.Def.Name = new(Name)
-	}
-
 	Array_array = int(Rnd(0, int64(Widthptr)))
 	Array_nel = int(Rnd(int64(Array_array)+int64(Widthptr), int64(Widthint)))
 	Array_cap = int(Rnd(int64(Array_nel)+int64(Widthint), int64(Widthint)))

src/cmd/compile/internal/gc/go.go

@@ -305,12 +305,6 @@ const (
 	Ecomplit  = 1 << 11 // type in composite literal
 )
 
-type Typedef struct {
-	Name   string
-	Etype  EType
-	Sameas EType
-}
-
 type Sig struct {
 	name   string
 	pkg    *Pkg
@@ -670,7 +664,6 @@ type Arch struct {
 	Thechar      int
 	Thestring    string
 	Thelinkarch  *obj.LinkArch
-	Typedefs     []Typedef
 	REGSP        int
 	REGCTXT      int
 	REGCALLX     int // BX

src/cmd/compile/internal/gc/lex.go

@@ -2077,6 +2077,18 @@ var basicTypes = [...]struct {
 	{"any", TANY},
 }
 
+var typedefs = [...]struct {
+	name     string
+	etype    EType
+	width    *int
+	sameas32 EType
+	sameas64 EType
+}{
+	{"int", TINT, &Widthint, TINT32, TINT64},
+	{"uint", TUINT, &Widthint, TUINT32, TUINT64},
+	{"uintptr", TUINTPTR, &Widthptr, TUINT32, TUINT64},
+}
+
 var builtinFuncs = [...]struct {
 	name string
 	op   Op
@@ -2223,12 +2235,29 @@ func lexinit1() {
 	s.Def = typenod(runetype)
 	s.Def.Name = new(Name)
 
-	// backend-specific builtin types (e.g. int).
-	for i := range Thearch.Typedefs {
-		s := Pkglookup(Thearch.Typedefs[i].Name, builtinpkg)
-		s.Def = typenod(Types[Thearch.Typedefs[i].Etype])
-		s.Def.Name = new(Name)
-		s.Origpkg = builtinpkg
+	// backend-dependent builtin types (e.g. int).
+	for _, s := range typedefs {
+		s1 := Pkglookup(s.name, builtinpkg)
+
+		sameas := s.sameas32
+		if *s.width == 8 {
+			sameas = s.sameas64
+		}
+
+		Simtype[s.etype] = sameas
+		minfltval[s.etype] = minfltval[sameas]
+		maxfltval[s.etype] = maxfltval[sameas]
+		Minintval[s.etype] = Minintval[sameas]
+		Maxintval[s.etype] = Maxintval[sameas]
+
+		t := typ(s.etype)
+		t.Sym = s1
+		Types[s.etype] = t
+		s1.Def = typenod(t)
+		s1.Def.Name = new(Name)
+		s1.Origpkg = builtinpkg
+
+		dowidth(t)
 	}
 }
 

src/cmd/compile/internal/mips64/galign.go

@@ -29,16 +29,6 @@ func linkarchinit() {
 
 var MAXWIDTH int64 = 1 << 50
 
-/*
- * go declares several platform-specific type aliases:
- * int, uint, and uintptr
- */
-var typedefs = []gc.Typedef{
-	{"int", gc.TINT, gc.TINT64},
-	{"uint", gc.TUINT, gc.TUINT64},
-	{"uintptr", gc.TUINTPTR, gc.TUINT64},
-}
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -49,7 +39,6 @@ func Main() {
 	gc.Thearch.Thechar = thechar
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
-	gc.Thearch.Typedefs = typedefs
 	gc.Thearch.REGSP = mips.REGSP
 	gc.Thearch.REGCTXT = mips.REGCTXT
 	gc.Thearch.REGCALLX = mips.REG_R1

src/cmd/compile/internal/ppc64/galign.go

@@ -29,16 +29,6 @@ func linkarchinit() {
 
 var MAXWIDTH int64 = 1 << 50
 
-/*
- * go declares several platform-specific type aliases:
- * int, uint, and uintptr
- */
-var typedefs = []gc.Typedef{
-	{"int", gc.TINT, gc.TINT64},
-	{"uint", gc.TUINT, gc.TUINT64},
-	{"uintptr", gc.TUINTPTR, gc.TUINT64},
-}
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -54,7 +44,6 @@ func Main() {
 	gc.Thearch.Thechar = thechar
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
-	gc.Thearch.Typedefs = typedefs
 	gc.Thearch.REGSP = ppc64.REGSP
 	gc.Thearch.REGCTXT = ppc64.REGCTXT
 	gc.Thearch.REGCALLX = ppc64.REG_R3

src/cmd/compile/internal/x86/galign.go

@@ -23,16 +23,6 @@ func linkarchinit() {
 
 var MAXWIDTH int64 = (1 << 32) - 1
 
-/*
- * go declares several platform-specific type aliases:
- * int, uint, and uintptr
- */
-var typedefs = []gc.Typedef{
-	{"int", gc.TINT, gc.TINT32},
-	{"uint", gc.TUINT, gc.TUINT32},
-	{"uintptr", gc.TUINTPTR, gc.TUINT32},
-}
-
 func betypeinit() {
 	gc.Widthptr = 4
 	gc.Widthint = 4
@@ -43,7 +33,6 @@ func Main() {
 	gc.Thearch.Thechar = thechar
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
-	gc.Thearch.Typedefs = typedefs
 	gc.Thearch.REGSP = x86.REGSP
 	gc.Thearch.REGCTXT = x86.REGCTXT
 	gc.Thearch.REGCALLX = x86.REG_BX